Micrometer-caliper.



E. J. CADY. MICROMETER CAMPER. APPLICATION FILED MAY 31. 1918- Patented. Apr. 8,1919.

Tarball whom mayjc onceml' f Bait-known that LELIsHn J nssn CAnr ,"a.

J citizen of the United States, residingat Oak Park, in the county of Cook mast-awn elements, parts being. broken away .Illinois, have inventedqcertain new andjusefnl Improvements in ,lVIicrrimeterf-Calipers, ofwhich the following is a specification;'ref v erence being hadtherein to the accompanya ing drawing. A p a. I

My invention relates. to jlnlOlOlIl'QtBlfiCtLll- ,pers for measuring the'thick-nesses of various materials, and especially to such instruments for measuring the thicknesses of different grades or points ofpaperestock in which the material is graded invariations of i onethousandth part'of an inch. 1 C

llhe invention consists in the matters here-' inafter described and then pointed'out in i the appended claims, and its features are illustrated in the accompanying drawing'in Which, I

Figure 1 is a view in front elevation of the, device partly in perspective showing the general arrangement of the visiblerparts Fig. 2 is view in rear elevation of the b ack:

of the supportingphte With its assoc ated Fig. 3 is a vertical transverse sectional view on the line 3-3-ofF-ig.

Fig. tis a detail sectional view on the lined-AofFigQ, and H: V

Fig. 5 is a detail vertical sectional view on the line 55 of Fig.2. I v 1 In the drawingsthe reference numeral 10 represents the usual base having a central flat :anVil 11 and supporting a a curved bracket-arm 12 which carries .at'itg upper free end the usual circular casing'1'13 spaced at suitable distance above the baseandcar' ry ng a removable frontclosing-cap l i comprising a' glass face -lo and a rear; flange 16 fastened to the front flange 17 of nthe casing to provide a central chamber; I A circular supporting-plate 18 is secured V.bylag screws at 19 to the flange 17 and the usual'c1rcular dial 20 having an indicating sc'a'le on' whicjhthe gradations or divisions are'fliharked in" units of one-thousandth part of vaninch fromq zero to ".250. is clamped betweentthe front face of the plate 18fland a spacing band or bead 21in the cap 14 to leave a space between the glass-front of .the cap and the; plate 18 for the revoluble pointer 22 which, is mounted on the front squared end'of'a rev- 4 oluble spindle 23 projecting through an :r

opening at the center ofthe scaleandmounted 'to freely rotate in'bearings in the plate i Specification of- Letter carries a fixedpinion 26 rand its rear end the spindle is rotated to tmove the "pointer away from its; normal zero position/the v spring s put", under tension. A plunger 30 was 3 retested Apr.;s-,- 91;: if Application fileana sn-mrsi sfla in .237 4573 a a o a I '181andjn anofl'set bracket 2 i secured atgf 25 i I V on the rear face ofthe plate. Thespin dle 23i I is mounted in line with theanvilll .in suitlower portion of: the flanges 16:;and 17 and yable hearin'gs31 onthe rear face of the-plate 1 18to reciprocatenp'anddown, its lower end passmgfreelvthrough an opening in the anvil, and its upper end .passing through a j I ofthisjlever is depressed The plunger is ally'oflset arm138 1which reciprocates in a similar "opening in the upper portions of these flanges and carrying anoperatingham vdle 0r lever whichis pivoted at! one end on a pin-34in the top of the plunger and has I anintermediate cam face 35 adapted to 'bear 1 J on thefouter surfacer ofrtheflange 17 and raise the ,,plun ger when the outer? fr'eeend" it provided with a centralelongated'slot 36 to I enabl eg; it to freely straddle the spindlfii 23, andwith, an elongated'lateral recess 37 to L Y 1 enable ittoclear thepinion 26s I keeper 39 and {is provided at it free .(end' 3 'gwith a rearwardly projecting: shoulder40 fto' which one-end of a flat flexible'b'andl gissecured, andgtheother endof'this band is secured to the lower portion. of a drumsegnnnt 42 which is so disposed that its point'of contact with the bandwindingon Kit isin its tangential *line passing to the op 7 erat ive-fac'e of the "shoulder 40' so that the upward pull of the band on the drum is at all'tirnes direct -and=uniform.' The drum 42 is mounted on asegmental gear wheel; 43 whichf'is pivoted to the plate 18 at" 445.

with itsteeth engaging'the pinion 26 011 the.

spindle 23, a it is held in: its retracted position 'corjresponding to the zero position of the pointer on the dial by the pull of a strong-'' feturn-.spring 45" which se r at i i Q one end to the' gear wheel and atits oppositej-iend to the"plate18. The plunger is undercut as shownzatf4:6: to-flallowdhe gear I,

wheel 4 3eto engage the pinion 26 and; to

freelygturn on its pivot. hWhen the"lever'; I V

40 sired by a second return-spring 47 secured atone end to the end to the plate 18.

V 33 is depressed it raises the V plunger off the anvil and the movement" of the plunger is communicated to the gear to move the pointer. By this arrangement the power to turn the gear wheel is applied directly from the plunger to the wheel by fixed connections, instead of through the medium of intermediate gears as is customary 1n prior-devices of this kind, so that I V eliminate the factor of lost motion between the plunger and spindle which was due to the necessa ry, play of the intermeshing teeth of the former intermediate gears and rendered their devices inaccurate. Also, by this arrangement the pull of the plunger on the gear wheel'is' always direct in the tangential line of the drum so that the movestroke of the plunger and ment of the gear wheel and pointer is uniform during allportions of the measuring the strain on the several parts is reduced to a minimum. Unless the disk of the plunger ispressed strongly against the fabric resting on the anvil to be calipered any slight buckling or waving in the fabric has a tendency to hold the plunger up and thereby register by the pointer on the dial a higher or greater thickness than in fact characterizes the stock,

and the direct application of the'power of the return spring to the plunger overcomes this objection as the full retractive force of the spring is applied through direct con nections and so is not dissipated in overcoming the'friction and backlash of intermediate gears. Also, the return-spring 4:5 by this arrangement servesthe further function of keeping the band 41 taut. This return spring may be supplemented if deplunger and at its other When the handle is released the tendency of all return springs, especially when they are strong enough to overcome any unevenness in the fabric and hold it flush and flat on the anvil as is necessary to secure accurate measurements, is to force the plunger down upon the fabric with so much force that thepointer 1s jerked out of its true I position and its squared bearings' on the has feet and anvil so that its unlform,

I empl the check does not in any degree reduce the 1* Copies-Raf this patent ni'ay be obtained for-five azzents each, by addressing'the wheel 43 by the direct pull of the band 41 on the drum, and the gear wheel in turn rotates the spindle 23 calipering effect or force of the plunger. For this purpose I provide the plunger with an'otfsetpiston-arm 48 which carries at its upper free end a plunger 49 having an apron-like washer 50 of leather. or other suitable material which works in the open end of a pneumatic cylinder 51 fixed on the plate 18. When the plunger is raised the piston rises in its cylinder and expels the air which passes out between the washer and c linder wall, and when the plunger drops the vacuum in the cylinder is so slowly filled by the retardation of the passage of air into it past the expanding apron-washer of the plunger that the drop of the plunger is effectually cushioned, the top of the cylinder having a suitable vent-hole.

I claim 1. In a calipering device,an anvil, a reciprocating plunger, a gear-segment carrying a drum, fixed connections between the drum and plunger in the tangential line of the drum, a scale and revoluble pointer, a shaft carrying the pointer and a fixed pinion in mesh with the gear-segment, a-handle to raise the plunger, a return spring for the plunger.

2. In a calipering device, an anvil, a reciprocating plunger carrying a projecting shoulder, a gear-segment carrying a drumsegment in line with the shoulder, a flexible band connecting the drum-segment and shoulder, a scale and revoluble pointer, a shaft carrying the pointer and a fixed pinion in mesh with the gear-segment, a handle to raise the plunger, and a return spring for the plunger.

3. In a calipering device, an anvil, a reciprocating plunger, a gear-segment, connections between the segment and plunger, a scale and revoluble pointer, a shaft carrying the pointer and a fixed pinion in mesh with a gear-segment, a handle to raise the plunger, a return spring for the plunger, and means to cushion the return-stroke of the plunger.

4. In a calipering device, an anvil, a reciprocating plunger, a gear-segment, fixed connections between the segment and plunger, a scale and revoluble pointer, a'

shaft carrying the pointer and a fixed pinion in mesh with the gear-segment, a handle to raise the plunger, a return spring for the plunger, a piston carried by the plunger, and a pneumatic cylinder to cushion the piston on the return-stroke of the plunger.

In testimony whereof I afiix my signature in presence of two witnesses.

ELISHA JESSE OADY.

Witnesses:

JOHN J OHNSON, J. MCROBERTS.

Commissioner of latents,

Washington, I). O. 

